linux-kernel - Re: [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig [drivers/staging/comedi/drivers.o]

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Date:	Sun, 07 Jun 2009 20:06:45 +0530
From:	Subrata Modak <subrata@...ux.vnet.ibm.com>
To:	fmhess@...rs.sourceforge.net
Cc:	Greg KH <greg@...ah.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ian Abbott <abbotti@....co.uk>,
	David Miller <davem@...emloft.net>, sachinp@...ux.vnet.ibm.com,
	sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	Linuxppc-dev@...abs.org, linux-next@...r.kernel.org,
	paulus@...ba.org, Geert.Uytterhoeven@...ycom.com,
	geert@...ux-m68k.org
Subject: Re: [BUILD FAILURE 01/04] Next June 04:PPC64 randconfig
	[drivers/staging/comedi/drivers.o]

On Sat, 2009-06-06 at 09:36 -0400, Frank Mori Hess wrote:
> On Saturday 06 June 2009, Greg KH wrote:
> > Frank and Ian, any thoughts about the vmap call in the
> > comedi_buf_alloc() call?  Why is it using PAGE_KERNEL_NOCACHE, and what
> > is the prealloc_buf buffer used for?
> 
> It is a circular buffer used to hold data streaming either to or from a 
> board (for example when producing an analog output waveform).  Reads and 
> writes to the device files read/write to the circular buffer, plus a few 
> drivers do dma directly to/from it.  I personally don't have a problem 
> with requiring drivers to have their own dma buffers and making them copy 
> data between their private dma buffers and the main circular buffer.  I 
> guess the original design wanted to support zero-copy dma.

Great to hear that. How about a patch that solves my build problem on
PPC64(the problem seems to be existing for long) ? 

Regards--
Subrata

> 

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